<?php
/////////////////////////////////////////////////////////////////////////////
// 
//
// workflow_system
//
// workflow_copyright
// 
/////////////////////////////////////////////////////////////////////////////

/**
 * FILE_NAME : ajaxcommonpage.php   FILE_PATH : classes/libraries/ajaxcommonpage.php
 * ....ajax翻页类
 *
 * @copyright workflow_system 
 * @author workflow Develop Team 
 * @package 
 * @subpackage 
 * @version 2.0  Wed Aug 08 14:35:42 CST 2007
 * description:超强分页类，四种分页模式，默认采用类似baidu,google的分页风格。
 * 2.0增加功能：支持自定义风格，自定义样式，同时支持PHP4和PHP5,
 * to see detail,please visit [url=http://www.phpobject.net/blog/read.php]http://www.phpobject.net/blog/read.php[/url]?
 * example:
 * 模式四种分页模式：
   require_once('commonpage.php');
   $page=new page(array('total'=>1000,'perpage'=>20));
   echo 'mode:1<br>'.$page->show();
   echo '<hr>mode:2<br>'.$page->show(2);
   echo '<hr>mode:3<br>'.$page->show(3);
   echo '<hr>mode:4<br>'.$page->show(4);
   开启AJAX：
   $ajaxpage=new page(array('total'=>1000,'perpage'=>20,'ajax'=>'ajax_page','page_name'=>'test'));
   echo 'mode:1<br>'.$ajaxpage->show();
   采用继承自定义分页显示模式：
   demo:http://www.phpobject.net/blog
 */
class ajaxCommonPage
{
	/**
  * config ,public
  */
	var $page_name="curpage";//page标签，用来控制url页。比如说xxx.php?PB_page=2中的PB_page
	var $next_page='>';//下一页
	var $pre_page='<';//上一页
	var $first_page='First';//首页
	var $last_page='Last';//尾页
	var $pre_bar='<<';//上一分页条
	var $next_bar='>>';//下一分页条
	var $format_left='[';
	var $format_right=']';
	var $is_ajax=true;//是否支持AJAX分页模式
	var $page_num=5;//分页数量控制，5为显示5个页码
	var $style='';//分页样式
	var $is_drag = false; // 是否是应用在拖拽部分的分页，默认为否
	/**
 	 * private
 	 *
 	 */ 
	var $pagebarnum=10;//控制记录条的个数。
	var $totalpage=0;//总页数
	var $ajax_action_name='getPageContent';//AJAX动作名
	var $nowindex=1;//当前页
	var $url="";//url地址头
	var $offset=0;
	var $pagesize = 10;

	/**
  * constructor构造函数
  *
  * @param array $array['total'],$array['perpage'],$array['nowindex'],$array['url'],$array['ajax']...
  */

	function setPage($array)
	{
		if(is_array($array)){
			if(!array_key_exists('total',$array))$this->error(__FUNCTION__,'need a param of total');
			$total=intval($array['total']);
			$perpage=(array_key_exists('perpage',$array))?intval($array['perpage']):$this->pagebarnum ;
			$nowindex=(array_key_exists('nowindex',$array))?intval($array['nowindex']):'';
			$url=(array_key_exists('url',$array))?$array['url']:'';
		}else{
			$total=$array;
			$perpage=$this->pagebarnum;
			$nowindex='';
			$url='';
		}
		if((!is_int($total))||($total<0))$this->error(__FUNCTION__,$total.' is not a positive integer!');
		if((!is_int($perpage))||($perpage<=0))$this->error(__FUNCTION__,$perpage.' is not a positive integer!');
		if(!empty($array['page_name']))$this->set('page_name',$array['page_name']);//设置pagename
		$this->_set_nowindex($nowindex);//设置当前页
		$this->_set_url($url);//设置链接地址
		$this->totalpage=ceil($total/$perpage);
		$this->offset=($this->nowindex-1)*$perpage;
		//echo $this->perpage;
		if(!empty($array['ajax']))$this->open_ajax($array['ajax']);//打开AJAX模式

	}

	/**
  * 设定类中指定变量名的值，如果改变量不属于这个类，将throw一个exception
  *
  * @param string $var
  * @param string $value
  */
	function set($var,$value)
	{
		if(in_array($var,get_object_vars($this)))
		$this->$var=$value;
		else {
			$this->error(__FUNCTION__,$var." does not belong to PB_Page!");
		}

	}
	/**
  * 打开倒AJAX模式
  *
  * @param string $action 默认ajax触发的动作。
  */
	function open_ajax($action)
	{
		$this->is_ajax=true;
		$this->ajax_action_name=$action;
	}
	/**
  * 获取显示"下一页"的代码
  * 
  * @param string $style
  * @return string
  */
	function next_page($style='')
	{
		if($this->nowindex<$this->totalpage){
			return $this->_get_link($this->_get_url($this->nowindex+1),$this->next_page,$style);
		}
		return '<span class="'.$style.'">'.$this->next_page.'</span>';
	}

	/**
  * 获取显示“上一页”的代码
  *
  * @param string $style
  * @return string
  */
	function pre_page($style='')
	{
		if($this->nowindex>1){
			return $this->_get_link($this->_get_url($this->nowindex-1),$this->pre_page,$style);
		}
		return '<span class="'.$style.'">'.$this->pre_page.'</span>';
	}

	/**
  * 获取显示“首页”的代码
  *
  * @return string
  */
	function first_page($style='')
	{
		if($this->nowindex==1){
			return '<span class="'.$style.'">'.$this->first_page.'</span>';
		}
		return $this->_get_link($this->_get_url(1),$this->first_page,$this->style);
	}

	/**
  * 获取显示“尾页”的代码
  *
  * @return string
  */
	function last_page($style='')
	{
		if($this->nowindex==$this->totalpage){
			return '<span class="'.$style.'">'.$this->last_page.'</span>';
		}
		return $this->_get_link($this->_get_url($this->totalpage),$this->last_page,$this->style);
	}

	function nowbar($style='',$nowindex_style='')
	{
		$thismax = ceil($this->nowindex/$this->pagesize)*$this->pagesize;
		$thismin = $thismax-$this->pagesize+1;
		$mod = $this->nowindex%$this->pagesize;
		
        if ($mod == 0){
        	$begin = $thismin + intval($this->pagesize/2);
        	$dif = $begin - $thismin;
        	$end = $thismax + $dif;
        	if ($end > $this->totalpage){
				$end = $this->totalpage;
			}
        }elseif ($mod <= ceil($this->pagesize/2)){
			$begin = $thismin - (intval($this->pagesize/2) - $mod) - 1;
			if ($begin<1){
				$begin  = 1;
			}
			$dif = $thismin - $begin;
			$end = $thismax - $dif;
			if ($end > $this->totalpage){
				$end = $this->totalpage;
			}
		}else{
			$begin = $thismin + ($mod - intval($this->pagesize/2)) - 1;
			$end = $thismax + ($mod - intval($this->pagesize/2)) - 1;
			if ($end > $this->totalpage){
				$end = $this->totalpage;
			}
			//echo $begin;
		}
		//begin end
		$begin = $this->nowindex-$this->page_num > 0?$this->nowindex-$this->page_num:$begin;
		$end = ($this->nowindex+($this->page_num-1) > $end)?$end:$this->nowindex+($this->page_num-1);

		for($i=$begin;$i<=$end;$i++)
		{
			if($i!=$this->nowindex)
			$return.=$this->_get_link($this->_get_url($i),$i,$this->style);//$this->_get_text();
			else
			$return.=$this->_get_text('<span class="'.$nowindex_style.'">'.$i.'</span>');
		}
		/*
		if ($this->totalpage>10){
		$plus=ceil($this->pagebarnum/2);
		if($this->pagebarnum-$plus+$this->nowindex>$this->totalpage)$plus=($this->pagebarnum-$this->totalpage+$this->nowindex);
		$begin=$this->nowindex-$plus+1;
		$begin=($begin>=1)?$begin:1;
		}
		else
		$begin = 1;
		$return='';

		for($i=$begin;$i<$begin+$this->totalpage;$i++)
		{
		if($i<=$this->totalpage){
		if($i!=$this->nowindex)
		$return.=$this->_get_text($this->_get_link($this->_get_url($i),$i,$style));
		else
		$return.=$this->_get_text('<span class="'.$nowindex_style.'">'.$i.'</span>');
		}else{
		break;
		}
		$return.="\n";
		}
		*/
		unset($begin);
		return $return;
	}
	/**
  * 获取显示跳转按钮的代码
  *
  * @return string
  */
	function select()
	{
		
		if ($this->is_ajax = true){
		$return='<select name="PB_Page_Sel" onchange="javascript:' . $this->ajax_action_name . '(\'' . $this->_get_url($i) . '\'+this.value);">';
		}else{
			$return='<select name="PB_Page_Sel" onchange="location.href=\'' . $this->_get_url($i) . '\' + this.value">';
		}

		for($i=1;$i<=$this->totalpage;$i++)
		{
			if($i==$this->nowindex){
				$return.='<option value="'.$i.'" selected>'.$i.'/'.$this->totalpage.'</option>';
			}else{
				$return.='<option value="'.$i.'">'.$i.'/'.$this->totalpage.'</option>';
			}
		}
		unset($i);
		$return.='</select>';
		return $return;
	}

	/**
  * 获取mysql 语句中limit需要的值
  *
  * @return string
  */
	function offset()
	{
		echo $this->offset;
		return $this->offset;
	}

	/**
  * 控制分页显示风格（你可以增加相应的风格）
  *
  * @param int $mode
  * @return string
  */
	function show($mode=1)
	{
		$lang_obj = new FrameWork;
		$lang_obj->setFrameWork();
		$lang_obj->getlang('common');
		switch ($mode)
		{
			case '1':
				$this->next_page = $lang_obj->_lang['langCNextPage'];
				$this->pre_page  = $lang_obj->_lang['langCPrePage'];
				return $this->pre_page().$this->nowbar().$this->next_page() . ' ' . $lang_obj->_lang['langCDi'] . $this->select() . $lang_obj->_lang['langCPage'];
				break;
			case '2':
				$this->next_page  = $lang_obj->_lang['langCNextPage'];
				$this->pre_page   = $lang_obj->_lang['langCPrePage'];
				$this->first_page = $lang_obj->_lang['langCIndex'];
				$this->last_page  = $lang_obj->_lang['langCTail'];
//				return $this->first_page() . $this->pre_page() . '[' . $lang_obj->_lang['langCDi'] . $this->nowindex . $lang_obj->_lang['langCPage'] . ']' . $this->next_page() . $this->last_page() . $lang_obj->_lang['langCDi'] . $this->select() . $lang_obj->_lang['langCPage'];
				return '['.$this->first_page() .'|'. $this->pre_page() .'|'. $this->next_page() .'|'. $this->last_page() .']'. $lang_obj->_lang['langCPageNum'] . ':' . $this->select();
				break;
			case '3':
				$this->next_page  = $lang_obj->_lang['langCNextPage'];
				$this->pre_page   = $lang_obj->_lang['langCPrePage'];
				$this->first_page = $lang_obj->_lang['langCIndex'];
				$this->last_page  = $lang_obj->_lang['langCTail'];
				return $this->first_page().$this->pre_page().$this->next_page().$this->last_page();
				break;
			case '4':
				$this->next_page = $lang_obj->_lang['langCNextPage'];
				$this->pre_page  = $lang_obj->_lang['langCPrePage'];
				return $this->pre_page().$this->nowbar().$this->next_page();
				break;
			case '5':
				return $this->pre_bar().$this->pre_page().$this->nowbar().$this->next_page().$this->next_bar();
				break;
			case '6':
				$this->first_page = $lang_obj->_lang['langCIndex'];
				$this->last_page  = $lang_obj->_lang['langCTail'];
				return $this->first_page().$this->nowbar().$this->last_page();
				break;
		}
		unset($lang_obj);
	}
	/*----------------private function (私有方法)-----------------------------------------------------------*/
	/**
  * 设置url头地址
  * @param: String $url
  * @return boolean
  */
	function _set_url($url="")
	{
		if(!empty($url)){
			//手动设置
			$this->url=$url.((stristr($url,'?'))?'&':'?').$this->page_name."=";
		}else{
			//自动获取
			if(empty($_SERVER['QUERY_STRING'])){
				//不存在QUERY_STRING时
				$this->url=$_SERVER['REQUEST_URI']."?".$this->page_name."=";
			}else{
				if ($this->is_ajax == true){
					$string_arr = explode("&",$_SERVER['QUERY_STRING']);
					foreach ($string_arr as $k=>$v){
						$sub_arr = explode("=",$v);
						$sub_arr[1] = urldecode($sub_arr[1]);
//						$sub_arr[1] = '\'+encodeURIComponent(\'' . $sub_arr[1] .'\')+\'';
						$string_arr[$k] = implode("=",$sub_arr);
					}
					$new = implode("&",$string_arr);
					$_SERVER['REQUEST_URI'] = str_replace($_SERVER['QUERY_STRING'],$new,$_SERVER['REQUEST_URI']);
				}
				if(stristr($_SERVER['QUERY_STRING'],$this->page_name.'=')){
					//地址存在页面参数
					$this->url=str_replace($this->page_name.'='.$this->nowindex,'',$_SERVER['REQUEST_URI']);
					$last=$this->url[strlen($this->url)-1];
					if($last=='?'||$last=='&'){
						$this->url.=$this->page_name."=";
					}else{
						$this->url.='&'.$this->page_name."=";
					}
				}else{
					//
					$this->url=$_SERVER['REQUEST_URI'].'&'.$this->page_name.'=';
				}//end if
			}//end if
		}//end if
	}

	/**
  * 设置当前页面
  *
  */
	function _set_nowindex($nowindex)
	{
		if(empty($nowindex)){
			//系统获取

			if(isset($_GET[$this->page_name])){
				$this->nowindex=intval($_GET[$this->page_name]);
			}
		}else{
			//手动设置
			$this->nowindex=intval($nowindex);
		}
	}

	/**
  * 为指定的页面返回地址值
  *
  * @param int $pageno
  * @return string $url
  */
	function _get_url($pageno=1)
	{
		return $this->url.$pageno;
	}

	/**
  * 获取分页显示文字，比如说默认情况下_get_text('<a href="">1</a>')将返回[<a href="">1</a>]
  *
  * @param String $str
  * @return string $url
  */ 
	function _get_text($str)
	{
		return $this->format_left.$str.$this->format_right;
	}

	/**
   * 获取链接地址
 */
	function _get_link($url,$text,$style=''){
		$style=(empty($style))?'':'class="'.$style.'"';
		if($this->is_ajax){
			if ($this->is_drag === true){
				$line = '<a '.$style.' href="javascript:;" onclick="javascript:'.$this->ajax_action_name.'('.intval($text).',\''.$url.'\')">'.$text.'</a>';
			}else {
				$line = '<a '.$style.' href="javascript:;" onclick="javascript:'.$this->ajax_action_name.'(\''.$url.'\')">'.$text.'</a>';
			}
			return $line;
		}else{
			return '<a '.$style.' href="'.$url.'">'.$text.'</a>';
		}
	}
	/**
   * 出错处理方式
 */
	function error($function,$errormsg)
	{
		die('Error Function <b>'.$function.'()</b> :'.$errormsg);
	}

	/**
	 * 每页显示的数量
	 *
	 * @param int $value
	 */
	function pagebarnum($value)
	{
		$this->pagebarnum = $value;
	}


}

?>